Simple code to test SMTP auth on servers.

test_smtp_auth.py

import base64
import socket
import argparse
import time


def read(s):
    print s.recv(512),


def send(s, text):
    print text
    s.send(text)
    s.send("\r\n")
    read(s)

parser = argparse.ArgumentParser(description='Test SMTP auth.')
parser.add_argument('username', help='Username')
parser.add_argument('password', help='Password')
parser.add_argument('server', help='Server')
parser.add_argument('port', default=25, help='port')
parser.add_argument('--ssl', action="store_true", help='SSL')

args = parser.parse_args()

b64user = base64.b64encode(args.username)
b64pass = base64.b64encode(args.password)

s = socket.socket()
s.connect((args.server, int(args.port)))

read(s)
time.sleep(1)
send(s, "EHLO smtptest.com")

if args.ssl:
    send(s, "STARTTLS")
    import ssl
    s = ssl.wrap_socket(s)

send(s, "AUTH LOGIN")
send(s, b64user)
send(s, b64pass)
send(s, "QUIT")

if s:
    s.close()